Bootstrap/lib/button-groups.less

// BUTTON GROUPS
// -------------


// Make the div behave like a button
.btn-group {
  position: relative;
  .clearfix(); // clears the floated buttons
}

// Space out series of button groups
.btn-group + .btn-group {
  margin-left: 5px;
}

// Optional: Group multiple button groups together for a toolbar
.btn-toolbar {
  .btn-group {
    display: inline-block;
  }
}

// Float them, remove border radius, then re-add to first and last elements
.btn-group .btn {
  position: relative;
  float: left;
  margin-left: -1px;
  .border-radius(0);
}
// Set corners individual because sometimes a single button can be in a .btn-group and we need :first-child and :last-child to both match
.btn-group .btn:first-child {
  margin-left: 0;
     -webkit-border-top-left-radius: 4px;
         -moz-border-radius-topleft: 4px;
             border-top-left-radius: 4px;
  -webkit-border-bottom-left-radius: 4px;
      -moz-border-radius-bottomleft: 4px;
          border-bottom-left-radius: 4px;
}
.btn-group .btn:last-child,
.btn-group .dropdown-toggle {
     -webkit-border-top-right-radius: 4px;
         -moz-border-radius-topright: 4px;
             border-top-right-radius: 4px;
  -webkit-border-bottom-right-radius: 4px;
      -moz-border-radius-bottomright: 4px;
          border-bottom-right-radius: 4px;
}
// Reset corners for large buttons
.btn-group .btn.large:first-child {
  margin-left: 0;
     -webkit-border-top-left-radius: 6px;
         -moz-border-radius-topleft: 6px;
             border-top-left-radius: 6px;
  -webkit-border-bottom-left-radius: 6px;
      -moz-border-radius-bottomleft: 6px;
          border-bottom-left-radius: 6px;
}
.btn-group .btn.large:last-child,
.btn-group .large.dropdown-toggle {
     -webkit-border-top-right-radius: 6px;
         -moz-border-radius-topright: 6px;
             border-top-right-radius: 6px;
  -webkit-border-bottom-right-radius: 6px;
      -moz-border-radius-bottomright: 6px;
          border-bottom-right-radius: 6px;
}

// On hover/focus/active, bring the proper btn to front
.btn-group .btn:hover,
.btn-group .btn:focus,
.btn-group .btn:active {
  z-index: 2;
}


// Split button dropdowns
// ----------------------

// Give the line between buttons some depth
.btn-group .dropdown-toggle {
  padding-left: 8px;
  padding-right: 8px;
  @shadow: inset 1px 0 0 rgba(255,255,255,.125), 0 1px 2px rgba(0,0,0,.05);
  .box-shadow(@shadow);
}

// Reposition menu on open and round all corners
.btn-group.open .dropdown-menu {
  display: block;
  top: 30px;
  .border-radius(5px);
  &.large { top: 40px; }
}
.btn-group.open .dropdown-toggle {
  background-image: none;
  @shadow: inset 0 1px 6px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05);
  .box-shadow(@shadow);
}

// Reposition the caret
.btn .caret {
  margin-top: 6px;
  margin-left: 0;
}

// Account for other colors
.primary,
.danger,
.info,
.success {
  .caret {
    border-top-color: #fff;
    .opacity(75);
  }
}